Intro to Pressure Video Lessons

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Problem: A) The pressure at 10 m below the surface of the ocean is about 2.00×105 Pa.Which of the following statements is true?a) The weight of a column of seawater 1 m2 in cross section and 10 m high is about 2.00×105 N.b) The weight of a column of seawater 1 m2 in cross section and 10 m high plus the weight of a column of air with the same cross-section extending up to the top of the atmosphere is about 2.00×105  N.c) The weight of 1 m3 of seawater at 10 m below the surface of the ocean is about 2.00×105 N. d) The density of seawater is about 2.00×105 times the density of air at sea level.B) Now consider the pressure at 20 m below the surface of the ocean.The pressure is a) twice that at a depth of 10 mb) the same as that at a depth of 10 mc) equal to that at a depth of 10 m plus the weight of a column of seawater 1 m2 in cross section and 10 m high.d) equal to the weight of a column of seawater 1 m2 in cross section and 20 m high.

FREE Expert Solution

P=F (N)A (m2) 

P10 = Patm + PWater

1 Pa = 1 N/m2 (1 N in a cross-section of 1 m2

A) 

Weight is a force. Thus, the correct answer is

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Problem Details

A) The pressure at 10 m below the surface of the ocean is about 2.00×10Pa.

Which of the following statements is true?

a) The weight of a column of seawater 1 m2 in cross section and 10 m high is about 2.00×10N.

b) The weight of a column of seawater 1 m2 in cross section and 10 m high plus the weight of a column of air with the same cross-section extending up to the top of the atmosphere is about 2.00×10 N.

c) The weight of 1 m3 of seawater at 10 m below the surface of the ocean is about 2.00×10N. 

d) The density of seawater is about 2.00×105 times the density of air at sea level.


B) Now consider the pressure at 20 m below the surface of the ocean.

The pressure is 

a) twice that at a depth of 10 m

b) the same as that at a depth of 10 m

c) equal to that at a depth of 10 m plus the weight of a column of seawater 1 m2 in cross section and 10 m high.

d) equal to the weight of a column of seawater 1 m2 in cross section and 20 m high.

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